IVGCVSW-2254 Add Reference workload for Maximum

Change-Id: Id7302c6b1df995ebe6eb8eb94bab38bee1b31b0b
diff --git a/src/backends/reference/workloads/Maximum.hpp b/src/backends/reference/workloads/Maximum.hpp
new file mode 100644
index 0000000..524afff
--- /dev/null
+++ b/src/backends/reference/workloads/Maximum.hpp
@@ -0,0 +1,22 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <iostream>
+
+namespace armnn
+{
+    template<typename T>
+    struct maximum
+    {
+        T
+        operator () (const T&  inputData0, const T&  inputData1) const
+        {
+            return std::max(inputData0, inputData1);
+        }
+    };
+
+} //namespace armnn